What is the difference between irritant and allergic contact dermatitis?

Irritant contact dermatitis is the more common form — caused by direct chemical damage to the skin from substances like soaps, detergents, acids, or solvents. It can affect anyone with sufficient exposure. Allergic contact dermatitis involves a type IV delayed hypersensitivity immune response — the immune system becomes sensitised to a specific substance and reacts on subsequent exposures, even to tiny amounts. Patch testing by a dermatologist can identify specific allergens in allergic contact dermatitis.

What are the most common causes of contact dermatitis?

Common irritants include soaps, shampoos, cleaning products, and repeated water exposure. Common allergens include nickel (in jewellery and belt buckles), fragrances, preservatives (particularly methylisothiazolinone in cosmetics), rubber chemicals (in gloves), hair dye (p-phenylenediamine), and preservatives in topical medications. Occupational exposure is significant for healthcare workers, hairdressers, construction workers, and those in food preparation.

How is contact dermatitis treated?

The most important step is identifying and avoiding the causative substance. Topical corticosteroids reduce acute inflammation. Barrier creams protect the skin from irritant exposure. Emollients restore the skin barrier. For allergic contact dermatitis, allergen avoidance is essential — even trace exposure can trigger reactions in sensitised individuals. Patch testing by a dermatologist identifies specific allergens and is the gold standard investigation for recurrent or unexplained contact dermatitis.

Can natural or organic products cause contact dermatitis?

Yes — "natural" does not mean non-reactive. Some of the most potent allergens are naturally derived, including fragrances from essential oils, lanolin, propolis, and botanical extracts. Tea tree oil, lavender, and chamomile can all cause allergic contact dermatitis in sensitised individuals. The key principle is that the specific chemical structure of a substance determines its allergenicity, not whether it is natural or synthetic. Patch testing identifies individual sensitivities regardless of the substance's origin.

Skinlow Risk

Contact dermatitis

A red, itchy rash caused by direct contact with a substance.

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Reviewed by Dr. Ciara Magee · Integrative Midwifery26 March 2026Emerging evidence

Quick answer

Contact dermatitis is an inflammatory skin reaction caused by direct exposure to irritants or allergens, presenting as a red, itchy rash. Identifying and avoiding triggers is primary; skin barrier support, anti-inflammatory naturals, and gut health approaches address underlying susceptibility.

Do any of these feel familiar?

Contact dermatitis presents as a red, itchy, sometimes blistered rash that develops where the skin has come into contact with an irritant or allergen
Common triggers include cleaning products, metals (particularly nickel), cosmetics, fragrances, latex, and certain plants
The rash typically appears within hours to a few days of exposure
Itching can be intense and disruptive to sleep
Many people describe the frustration of identifying the trigger — which may require careful detective work through patch testing — and then the significant lifestyle adjustment of consistently avoiding it

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